For a General Visitor visa:
You Must:
-18 yrs old or over
-Can be able to pay for your return or onward journey

Time taken

-Apply for visa up to 3 months before your date of travel to the UK.

Duration of your stay

-6 months with a General Visitor visa.

Documents required

-A current passport or other valid travel identification
-2 passport size colour photographs

During trip

-evidence that you can support yourself during your trip, eg bank statements or payslips for the last 6 months
Note : Tuberculosis (TB) test certificate (where applicable) if you’re staying longer than 6 months